Abstract: In the X-ray CT system according to an embodiment, a control means displaces and images imaging regions in the subject by controlling a top board driver and an imaging means such that the X-rays are projected onto the subject every time a top board is moved by a predetermined transfer amount. An acquiring means acquires projection data of the respective imaging regions. A reconstruction means, based on the projection data, reconstructs tomographic images for each predetermined size of a reconstruction region. In the scan control mode, the control means outputs the transfer amount corresponding to this mode to the top board driver. In the reconstruction control mode, the control means outputs the size of the reconstruction region corresponding to this mode to the reconstruction means.

Abstract: A ?-ray scanner includes a Solid-State Single-Photon Detector (“SSSPD”) and a ?-ray source, which may be a radioisotope such as Americium oxide (Am-241) that may not require certification since it has a low intensity that is safe even over extended periods of exposure to a human body. The ?-ray scanner may be used for monitoring a fixed object such as a pipe and includes an imaging assembly having a stationary annular gantry surrounding the pipe and an armature that fixedly supports the ?-source and the detector in mutual opposed alignment, so that they are constrained to move together. The armature rides around an inside periphery of the gantry, while the armature or the gantry moves laterally in a direction parallel to a rotation axis of the armature so as to move the ?-ray beam around and along the pipe.

Abstract: A contactless rotary joint has a stationary and a rotating part. Furthermore at least one of the parts has a rotary joint body made of a plastic material and holding a capacitive data link and a rotating transformer. The rotating transformer has a magnetic core for transmission of electrical power. To prevent interference of the capacitive data link by electrical and/or magnetic fields from the rotating transformer a shield is provided.

Abstract: A package inspection system is provided, where an electromagnetic-wave detection part is hardly affected by illumination light for optical detection. Below a gap 6c of a conveyor mechanism 6 for conveying a package, provided are an X-ray sensor 13 for detecting X rays transmitted through the package and an illumination part 16 for applying illumination light to the gap 6c. The X-ray sensor 13 and the illumination part 16 are separated from each other by a partition 42. A light-shielding member 43 is placed in the path of X-ray incidence to the X-ray sensor 13. The light-shielding member 43 is formed of a material that allows passage of the X rays but does not allow passage of the illumination light and is hardly deteriorated by irradiation of the X rays, e.g., a carbon sheet.

Abstract: A controller and a related method of controlling a collimator. The controller operates to select a collimator setting for collimator of an x-ray imager for acquiring an image of a ROI in a patient. The controller operates to select the collimator setting to optimize the patient dosage in respect of primary radiation and secondary radiation dosage of medical staff. A position detector supplies to the controller a current position of a person relative to a patient. Based on said supplied position, the controller's configured to perform an optimization procedure that takes into account the staff dosage in respect of the secondary radiation dosage to reduce the secondary radiation dosage.

Abstract: An ultrasound imaging system provides for defining a VOI in an ultrasound imaging space. The system defines an initial frame of the VOI in the ultrasound imaging space, receives a selection of at least one reference point at an arbitrary location in the ultrasound imaging space, creates at least one curved surface using at least one element of the initial frame and the at least one reference point, and then creates VOI based on the curved surface in the ultrasound imaging space.

Abstract: The embodiments relate to a circuit for transmitting an input voltage from an electrical energy source in a stator to a load within a device movable relative to the stator including an control element for converting an input voltage into a transmission voltage, a resonant circuit for receiving the transmission voltage, wherein the resonant circuit contains a capacitor and a primary winding of a transformer and the transformer having the primary winding and a secondary winding, wherein the primary winding is provided for transmitting the transmission voltage to the secondary winding and the secondary winding is provided for supplying the received transmission voltage to the load.

Abstract: A method and apparatus are provided to improve large field of view CT image acquisition by using at least two scanning procedures: (i) one with the radiation source and detector centered and (ii) one in an offset configuration. The imaging data obtained from both of the scanning procedures is used in the reconstruction of the image. In addition, a method and apparatus are provided for detecting motion in a reconstructed image by generating a motion map that is indicative of the regions of the reconstructed image that are affected by motion artifacts. Optionally, the motion map may be used for motion estimation and/or motion compensation to prevent or diminish motion artifacts in the resulting reconstructed image. An optional method for generating a refined motion map is also provided.

Abstract: Cone beam artifacts arise in circular CT reconstruction. The cone beam artifacts are substantially removed by reconstructing a reference image from measured data at circular source trajectory, generating synthetic data by forward projection of the reference image along a pre-determined source trajectory, which supplements the circular source trajectory to a theoretically complete trajectory, reconstructing a correction image from the synthetic data and applying a scaling factor whose value is adaptively determined and optimized based upon the minimization of a predetermined cone beam artifact metric. Ultimately, the cone beam artifact is substantially reduced by generating a corrected image using the reference image and the correction image that has been optimally scaled based upon the adaptively determined scaling factor value.

Abstract: A radiation therapy apparatus includes a radiation source and a ring shaped gantry. The gantry includes a static ring component and a dynamic ring component upon which the radiation source is mounted, the dynamic ring component is rotatable about its center and is provided in multiple arcuate parts that can be assembled together to form the dynamic ring component.

Abstract: Among other things, radiation systems and techniques for generating volumetric data and projections images of an object(s) under examination are provided. The radiation system comprises at least two detector arrays and at least one radiation source. During an examination, the radiation source and at least one detector array are rotated about the object while a second detector array is substantially fixed in place. In one embodiment, the radiation source is configured to, at times, illuminate the first detector array and, at times, illuminate the second detector array. For example, the radiation source may illuminate the first detector array during nearly all of the rotation while the second detector array is merely illuminated at a single gantry rotation angle. Information generated by the second detector array may be utilized to yield volumetric data while information generated by the first detector array may be utilized to yield a projection image, for example.

Abstract: A method includes: collecting projection data and recording electrocardiogram data when computed tomographic scanning is performed on a patient, selecting, from the projection data and based on the electrocardiogram data, first projection data related to each cardiac pixel in a same phase, and reconstructing, based on the first projection data, an image of the related cardiac pixel, to obtain a cardiac image; determining, based on the electrocardiogram data, a reconstruction phase of each reconstruction pixel in a first reconstruction region, where the first reconstruction region is an image region selected along the patient's head-to-foot direction from the cardiac image; and selecting, based on the reconstruction phase of each reconstruction pixel and from the projection data, second projection data related to the reconstruction pixel in the reconstruction phase, and reconstructing, based on the second projection data, an image of the reconstruction pixel.

Abstract: We provide a radiotherapeutic apparatus comprising a patient support, magnetic coils disposed around the patient support for creating a magnetic field therewithin, a radiation source producing a beam of radiation directed toward the patient support and mounted on a rotatable support thereby to rotate the radiation source around the patient support, a slip ring for conveying electrical power to the radiation source and located around the patient support, including at least one electrical interruption therein. This creates a slip ring in which there is no continuous circumferential path, and one in which the current is therefore forced to take a route via one side or the other.

Abstract: A CT scanner comprises: at least one source of X-rays and a multi-row detector array of arbitrary geometry, both supported so as rotate around an axis of rotation during a scan of an object translated along the axis, wherein data for each detector is generated as a function of the X-ray energy received; and a data processor configured so as to perform resampling of the data onto curves in a virtual detector array. The curves project onto tilted lines in a virtual flat detector as to enable tangential filtering of the data.

Abstract: An apparatus (130) and a method for adjusting, in perfusion imaging system, a periodic contrast agent injection rate signal (IS) for an injector (135) as function of an image sampling rate determined by the rotational speed of an X-ray source (107)-detector (109) assembly of an X-ray imager (100). Frequency, periodicity and pulse width of the contrast agent injection rate signal (IS) is adjusted to mitigate temporal signal aliasing in a sample of a time attenuation contrast (TAC) signal.

Abstract: An X-ray CT scanner for imaging an object is provided. The scanner includes an X-ray emitter configured to emit X-ray beams, a detector array including a plurality of detector elements, and a precollimator positioned between the X-ray emitter and the object, the precollimator configured to prevent the emitted X-ray beams from being directly incident on a first subset of the plurality of detector elements, and allow the emitted X-ray beams to be directly incident on a second subset of said plurality of detector elements. A processing device communicatively coupled to the detector array is configured to determine a signature of the object based on a first set of data acquired using the first subset of the plurality of detector elements, and tomographically reconstruct an image of the object based on a second set of data acquired using the second subset of said plurality of detector elements.

Abstract: An image reconstruction apparatus and related method. The amount of out-field-of view material for a CT scanner (IMA) with a given field of view (FoV) in a bore (B) is established. Based on the measurement, a hybrid-image reconstructor (RECONX) is configured to switch between different reconstruction algorithms.

Abstract: Among other things, one or more techniques and/or systems are described for measuring the attenuation of a line integral through an object via a photon counting cell (302) and via an energy integrating cell (304). That is, an imaging apparatus is provided that comprises a radiation source (208) and a detector array (210). The detector array is comprised of both photon counting cells (302) and energy integrating cells (304) arranged such that, during an examination of the object, attenuation of a line integral through the object is measured by at least one photon counting cell and at least one energy integrating cell. In this way, at least two substantially complete views of an object may be acquired, one from measurements yielded from the photon counting cell (and other photon counting cells) and one from measurements yielded from the energy integrating cell (and other energy integrating cells).

Abstract: A method for generating a projection image from tomographic images first captures (S101) a number of stacked two-dimensional tomographic images representing a tomographic volume. The pixels of the stacked two-dimensional tomographic images are weighted (S102) along a number of projection beams through the tomographic volume with weighting factors that are chosen under the constraint that the sum of all squared weighting factors for each individual projection beam is between a given lower limit and a given upper limit. Then the weighted pixels are summed up (S103) along the number of projection beams for generating the two-dimensional projection image.

Abstract: A three-dimensional/four-dimensional (3D/4D) imaging apparatus and a region of interest (ROI) adjustment method and device are provided. An ROI is adjusted through an E image in a 3D/4D imaging mode, in which the E image is refreshed in real time when the ROI is adjusted and has a scan line range larger than that of the ROI.

Abstract: Representations of an object (110) in an image generated by an imaging apparatus (100) can comprise two or more separate sub-objects, producing a compound object (500). Compound objects can negatively affect the quality of object visualization and threat identification performance. As provided herein, a compound object (500) can be separated into sub-objects. Three-dimensional image data of a potential compound object (500) is projected into a two-dimensional manifold projection (504), and segmentation is performed on the two-dimensional manifold projection of the compound object to identify sub-objects. Once sub-objects are identified, the two-dimensional, segmented manifold projection (900) is projected into three-dimensional space (1104). A three-dimensional segmentation may then be performed to identify additional sub-objects of the compound object that were not identified by the two-dimensional segmentation.

Abstract: Difference of resolution depending on imaging position in one reconstructed image generated in the FFS method is reduced to improve measurement accuracy. The X-ray CT device interpolates missing data of the projection data obtained by the FFS method with view direction interpolation processing using real data of the projection data lining up along the angular direction of the rotational movement, and channel direction interpolation processing using real data of the projection data lining up along the channel direction, and generates a reconstructed image, in which contribution ratios of the projection data having been subjected to the view direction interpolation processing and the projection data having been subjected to the channel direction interpolation processing differ according to position of pixel in the reconstructed image.

Abstract: A package inspection system includes a conveyor mechanism 6, an X-ray generator 10 applying X rays to a package W1 conveyed by the conveyor mechanism 6, an X-ray sensor 13, and an optical sensor 15. First image data showing the outline of the content of the package W1 are generated based on detection output from the X-ray sensor 13. Second image data showing the outline of the wrapping of the package W1 are generated based on detection output from an optical sensor 15. The relative position of the wrapping and the content is determined based on the first and second image data, so that failures, e.g., the content caught in a seal of the wrapping can be detected accurately. The package inspection system can accurately determine a position of a wrapping and the content of a package even if a package has a light non-transmissive wrapping.

Abstract: X-ray CT system is provided that reduces waiting time for shuttle scanning, comprising: top-plate moving unit; rotary moving unit; data acquisition system; and control unit. Top-plate moving unit displaces top plate to reciprocate in a direction from a starting point to an ending point and in the direction from the ending point to the starting point. Rotary moving unit drives X-ray radiator radiating X-rays to revolve around the subject. Data acquisition system detects X-rays passed through the subject and to gather projection data. Controller controls at least top-plate moving unit so that, during a scanning with X-rays, while projection data are gathered with reciprocating movement of top plate between the starting point and the ending point and with X-ray radiator being driven to make revolving movement, the duration required for reciprocation of the top plate movement being an integral multiple of revolution period of the revolving movement of X-ray radiator.

Abstract: This invention relates to a high resolution and low dosage tomographic imaging in three dimensions, and more particularly, to a fully analytical fast iterative statistical algorithm for image reconstruction from projections obtained in a spiral cone-beam x-ray scanner is described. The presented method allows to improve the resolution of the reconstructed images and/or to decrease the x-ray intensity while maintaining the quality of the obtained CT images, because the signals obtained are adapted to the specific statistics for this imaging technique. The location of pixels in a reconstructed image and the location of detectors in a detector array in this new approach are described. The topology of pixels and detectors presented here avoids an inconsistency in the distribution of the coefficients assigned to the pixels in the image, which appears in the formulation of the analytical iterative statistical reconstruction problem.

Abstract: An information processing method includes: converting voxel data to node data in which a voxel, which has a brightness value that is outside a certain brightness value range, is set as a first node, and a voxel, which has a brightness value that is within the certain brightness value range, is set as a second node that has a capability to extract relating nodes based on a neighborhood relationship between voxels; performing, for each second node, a calculation processing to calculate an output value of a reaction-diffusion equation by using a value corresponding to a brightness value of the second node and values corresponding to brightness values of relating nodes extracted from the second node, a predetermined number of times; and determining a brightness value of each second node from the output value of the reaction-diffusion equation after performing the calculation processing the predetermined number of times.

Abstract: Systems, methods and non-transitory computer readable media for imaging. The system includes one or more radiation sources and detectors configured to transmit x-ray radiation towards a subject for imaging a dynamic process in a ROI of the subject and to acquire projection data corresponding to the ROI, respectively. The system also includes a computing device operatively coupled to one or more of the radiation sources and the detectors. The computing device is configured to provide control signals for performing one or more reference scans for acquiring reference data from a plurality of angular positions around the subject and for performing one or more tomosynthesis scans using one or more tomosynthesis trajectories for acquiring tomosynthesis data following the onset of the dynamic process. Additionally, the computing device is configured to reconstruct one or more images representative of the dynamic process using the reference data and/or the tomosynthesis data.

Abstract: A portable CT scanner may include a rotatable frame with separable portions. An x-ray source may be coupled to one portion of the rotatable frame, and an x-ray detector may be coupled to another portion of the rotatable frame. During storage and transportation, one portion of the rotatable frame may be housed in a first enclosure, and another portion of the rotatable frame may be housed in a second enclosure. When operation of the scanner is desired, the two enclosures may be connected, and/or the rotatable frame portions may be connected with the enclosures abutting one another, to allow for rotation of the rotatable frame about an aperture formed by the enclosures.

Abstract: An X-ray CT apparatus according to an embodiment includes: an X-ray irradiator configured to emit X-rays to the examinee on a table; an X-ray detector configured to detect X-rays transmitted through the examinee on the table; a data collector configured to collect transmission data on those X-rays; a movement drive unit configured to move one of the table and the X-ray irradiator relative to the other in an outward direction and then in a homeward direction, the outward direction and homeward direction being opposite directions along a body axis of the examinee on the table; a position detector configured to detect a relative position between the table and the X-ray irradiator; and a data collection controller configured to control timings for starting and stopping data collection by the data collector, based on the relative position between the table and the X-ray irradiator.

Abstract: A rotating unit of a medical imaging device has a hydrostatic slide bearing and an integrated coolant conduit. The rotating unit includes at least one stator, at least one rotor that is borne such that it can rotate relative to the stator, and at least one portion of a circulation system for the circulation of a bearing medium, so the rotor is borne hydrostatically floating by the bearing medium. The at least one portion of the circulation system for the circulation of the bearing medium also has at least one stator-side opening and one rotor-side opening to the hydrostatic slide bearing. The rotating unit additionally has at least one at least single-channel rotary joint mounted between the rotor and the stator. The rotating unit is designed such that the bearing medium can be supplied through the stator-side opening into the hydrostatic slide bearing and the bearing medium can be supplied again through the rotor-side opening and the rotary joint into the circulation system again.

Abstract: An X-ray tube mount for mounting an X-ray tube assembly to the rotating disk assembly of a CT imaging system, said X-ray tube mount including a housing having an inner end and an outer end, wherein said inner end of said housing is located closer to the center of rotation of the rotating disk assembly than said outer end of said housing; and at least one mounting construct for mounting said housing to the rotating disk assembly, wherein said at least one mounting construct is disposed intermediate said inner end of said housing and said outer end of said housing.

Abstract: An imaging system (500) includes a focal spot (508) that rotates along a path around an examination region and emits a radiation beam that traverses a field of view of the examination region and a subject or object therein. The system further includes a detector array (520) that is located opposite the radiation source, across the examination region. The detector array detects radiation traversing the field of view and outputs a signal indicative of the detected radiation. The system further includes a beam shaper that is located between the radiation source and the examination region. The beam shaper rotates with the focal spot and, relative to the focal spot, in an opposite direction of the focal spot with a same angular frequency as the rotating of the focal spot and attenuates the radiation beam which reduces a flux density across the detector array at each rotational angle of the focal spot.

Abstract: A method of contrast-enhanced computed tomography (CT) imaging can include repeatedly scanning a target region at a frequency during a session, the frequency initially being a first rate. After detecting an increase of the attenuation of radiation by a contrast-enhanced first structure within a target region, the frequency can be increased to a second rate. After detecting a subsequent decrease in the attenuation, the frequency can be decreased to a third rate.

Abstract: A CT system includes a gantry having a rotatable base and having an opening for receiving an object to be scanned, and an AC-to-DC converter coupleable to a 3-phase AC facility power, and coupled through a DC bus to a gantry motor to rotationally drive the rotatable base using DC power from the AC-to-DC converter. Rotational energy in the rotatable base is converted to DC electrical energy in the gantry motor during gantry braking, and provided to the DC bus.

Abstract: A method, a computation unit and a CT system are disclosed for reconstructing CT image data, which includes a plurality of image voxels, by way of a weighted filtered back-projection. To weight the projection data during the filtered back-projection, a weight function is used, which weights the projection data from central beams which strike a detector row relatively close to the edge of the row relatively less, and which weights the projection data of central beams, which strike a detector row more relatively centrally, relatively more.

Abstract: An apparatus for cone beam computed tomography of an extremity has a digital radiation detector and a first device to move the detector along a circular detector path extending so that the detector moves both at least partially around a first extremity of the patient and between the first extremity and a second, adjacent extremity. The detector path has radius R1 sufficient to position the extremity approximately centered in the detector path. There is a radiation source with a second device to move the source along a concentric circular source path having a radius R2 greater than radius R1, radius R2 sufficiently long to allow adequate radiation exposure of the first extremity for an image capture by the detector. A first circumferential gap in the source path allows the second extremity to be positioned in the first circumferential gap during image capture.

Abstract: A tomography system may be used to scan a subject and provide reconstructed images of the subject. A gantry of the tomography system has a rotary member that is rotatable around an axis. While the rotary member rotates, a skid layer provides safety features between the rotary member and a subject-facing scan window.

Abstract: Embodiments of systems, methods and non-transitory computer readable media for imaging are presented. Preliminary image data corresponding to a first FOV of a subject at a first resolution is acquired using an imaging system including one or more radiation sources and at least one hybrid detector, specifically using at least one section of the hybrid detector having the first resolution. The target ROI is identified using the preliminary image data. Further, the subject is positioned to align the target ROI along a designated axis. Additionally, parameters associated with the sources, the hybrid detector and/or an imaging system gantry are configured for acquiring target image data at a second resolution greater than the first resolution using at least one section of the hybrid detector having the second resolution. Further, one or more images corresponding to at least the target ROI are reconstructed using the target and/or the preliminary image data.

Abstract: Methods and apparatus are disclosed for obtaining an x-ray image from an x-ray imaging apparatus using a digital radiography receiver installed as a retrofit connection apparatus to adapt the x-ray imaging apparatus for use with the digital radiography receiver by using a receiver interface channel to communicating signals to and from the digital radiography receiver, using an operator actuated switch cover for at least an expose operator action of a manual operator control that is configured to generate at least an input expose signal, where the operator actuated switch cover is configured to resist the generation of the expose signal by the expose operator action of the manual operator control until a reset of the DR receiver is initiated and acknowledged.

Abstract: A radiation imaging apparatus has a camera installed on a gantry, and a method creates volume data of a subject through images of the subject photographed by the camera and calculates an optimum dose of radiation based on the volume data of the subject. The radiation imaging apparatus includes the gantry, and the camera installed on the gantry to photograph a subject.

Abstract: In an image processing system, a selecting unit selects a group of reference parallax images to be used as a reference, from among a plurality of groups of parallax images generated from image data taken chronologically; an image quality changing unit changes an image quality of at least one selected from between the selected group of reference parallax images and a group of parallax images contained in the groups of parallax images; and a display control unit causes images to be displayed that are formed by combining the group of parallax images contained in the groups of parallax images with the image-quality-changed group of reference parallax images, or by combining the selected group of reference parallax images with the image-quality-changed group of parallax images, or by combining together the image-quality-changed group of reference parallax images and the image-quality-changed group of parallax images contained in the groups of parallax images.

Abstract: An apparatus and method are provided for measuring flow velocity of a multi-phase fluid mixture. The proposed apparatus includes a radiation device, a detection device, and an analysis device. The radiation device generates a beam of photons to irradiate the mixture spatially over a section of flow of the mixture. The detection device is spatially configured to receive photons emanating from the section of flow of the mixture at different intervals of time. The detection device provides an image of a spatial distribution of the received photons for each the interval of time. The analysis device determines flow velocity of one or more phases of the mixture based on a temporal sequence of the images of the spatial distributions of the received photons.

Abstract: According to one embodiment, an apparatus includes a reconstructing unit, a first control unit, a detecting unit, a generating unit, and a second control unit. The first control unit controls the reconstructing unit to reconstruct first images based on projection data collected in first periods. The detecting unit detects second periods which belong to pulsation cycles different from one another and in which an organ to be imaged is in the substantially same form, based on the first images. The generating unit generates data for reconstruction including projection data for the required angle range by combining projection data collected in third periods close to the second periods. The second control unit controls the reconstructing unit to reconstruct a second image based the data for reconstruction.

Abstract: The present invention relates to a computed tomography system (10) and a corresponding method which enable tracking of a contrast material bolus and which involve a reduced radiation dose.

Abstract: A method includes identifying at least first and second angles of rotation of the rotating gantry at which first and second pre-scans are acquired, wherein the first and the angles of rotation are different angles, acquiring data, via the imaging system while rotating the rotating gantry, only during a predetermined angular range about the first angle of rotation for a first plurality of rotations from the start to the end pre-scan positions and during the predetermined angular range about the second angle of rotation for a second plurality of rotations from the start to the end pre-scan positions, and reconstructing a first pre-scan based only on the data acquired during the predetermined angular range about the first angle of rotation and a second pre-scan based only on the data acquired during the predetermined angular range about the second angle of rotation.

Abstract: An X-ray CT apparatus includes: an X-ray detector in which detecting elements that detect X-rays are arranged in a body-axis direction and a rotation direction; an acquiring unit that acquires signals of the X-rays detected by at least one group of detecting elements which includes a predetermined quantity of detecting elements and in which detecting elements are arranged in at least the rotation direction and that, when reading the signals detected by the detecting elements arranged in the rotation direction from the X-ray detector, sequentially reads the signals at times that vary among the detecting elements arranged in the rotation direction; a correction signal acquiring unit that, in accordance with the signal reading times, acquires correction signals used in a correcting process performed when an image is generated; and an image generating unit that generates the image by applying each correction signal to a corresponding one of the signals.

Abstract: A gantry rotation control device for a computed tomography scanning apparatus The device includes a radiation dose determination unit for determining radiation doses of the X-rays that will be emitted to each site of the target object to be scanned, a minimum velocity determination unit for determining a minimum rotation velocity of the gantry according to a maximum radiation dose in the determined radiation doses, a maximum velocity determination unit for determining a maximum rotation velocity of the gantry according to the determined minimum rotation velocity, a rotation velocity determination unit for determining a rotation velocity of the gantry at any time during scanning of the target object according to the determined minimum rotation velocity and maximum rotation velocity, and a gantry rotation control unit for controlling the gantry to scan the target object while rotating according to the determined rotation velocity when the target object is to be scanned.

Abstract: A x-ray apparatus of the present application comprises: a vacuum box which is sealed at its periphery, and the interior thereof is high vacuum; a plurality of electron transmitting units arranged in a linear array and installed on the wall at one end within the vacuum box, each electron transmitting unit is independent to each other; the electron transmitting unit having: a heating filament; a cathode connected to the heating filament; a grid arranged above the cathode opposing the cathode; anode made of metal and installed at the other end of the vacuum box, and in the direction of length, the anode is parallel to the plane of the grid of the electron transmitting unit, and in the direction of width, the anode has a predetermined angle with respect to the plane of the grid of the electron transmitting unit.

Abstract: An X-ray CT apparatus is configured capable of properly calculating a radiation dosed amount more approximating to an actually exposed radiation dose that includes scattering rays of an examined object from data measured at the scanning time. A function or table showing a relationship between data obtained on the basis of the measured data of the object detected by an X-ray detector at the scanning time and the radiation dosed amount is stored in advance; and the X-ray CT apparatus calculates the radiation dosed amount of the object in accordance with the data obtained on the function or table showing the relationship between the data obtained on the basis of the measured data of the object stored in advance and the radiation dosed amount.

Abstract: A cone-beam scanning system scans along a half circle. The reconstruction uses a weighting function which decreases for rows farther from the scan plane to take the redundancy of the projection data into account. Another embodiment uses a circle plus sparse helical scan geometry. Image data can be taken in real time.